[FIX] TechStack - Jackson 역직렬화 관련 오류 해결

src/main/java/org/autorepo/server/domain/readme/dto/request/TechStack.java

@@ -2,9 +2,22 @@
 
 import lombok.Data;
 
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
 @Data
+@Getter
+@RequiredArgsConstructor
 public class TechStack {
-    private String name;
-    private String color;
-    private String icon;
+
+    @JsonProperty("name")
+    private final String name;
+
+    @JsonProperty("color")
+    private final String color;
+
+    @JsonProperty("icon")
+    private final String icon;
 }
+